Sorry for the inconvenience. Known Navigation header breakage, its being "rebuilt" but forward nav should be ok now.
There may be other unforeseen breakage primarily in the handbook portion of the wiki.
The Table Of Contents section of each "PC-BSD® Users Handbook" page may be the best workaround.
Écran d'installation terminé
(Sorry for the inconvenience)
The screen shown in Figure 3.6a appears once the installation is complete. It again provides the opportunity to save the installation configuration to a USB stick.
Click the "Finish" button to reboot into your PC-BSD® installation. Wait until the installer exits before removing the installation media.